393
FNCA52 TJSJ 181930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST SAT APR 18 2026
DISCUSSION
NO FIRE DANGER IS EXPECTED TODAY.
PRZ014-190800-
SOUTHEAST COASTAL PLAINS-
330 PM AST SAT APR 18 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 80 70 40 50
TEMP (24H TREND) 69 (-2) 87 (+2) 70 87
RH % (24H TREND) 92 (0) 59 (-7) 93 58
WIND 20FT/EARLY(MPH) E 13 E 16 E 12 E 16
WIND 20FT/LATE(MPH) NE 10 E 17 NE 11 E 17
MIXING HGT(FT-AGL/MSL) 5220 5140
TRANSPORT WND (MPH) E 14 E 14
VENT RATE (KT-FT) 62640 61680
DISPERSION 5 5
DSI 5 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-190800-
SOUTHERN HILLS-
330 PM AST SAT APR 18 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 70 50 40 60
TEMP (24H TREND) 66 (-3) 83 (+3) 66 83
RH % (24H TREND) 98 (+5) 65 (-8) 98 65
WIND 20FT/EARLY(MPH) E 12 E 12 E 11 E 12
WIND 20FT/LATE(MPH) E 11 E 13 NE 12 E 12
MIXING HGT(FT-AGL/MSL) 5440 5570
TRANSPORT WND (MPH) E 13 E 12
VENT RATE (KT-FT) 59840 55700
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-190800-
NORTH COASTAL PLAINS-
330 PM AST SAT APR 18 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 50 60 50
TEMP (24H TREND) 69 (-2) 86 (+1) 69 87
RH % (24H TREND) 100 (+4) 62 (-7) 99 59
WIND 20FT/EARLY(MPH) E 17 E 13 E 14 E 13
WIND 20FT/LATE(MPH) E 13 E 16 E 13 E 18
MIXING HGT(FT-AGL/MSL) 4690 4880
TRANSPORT WND (MPH) E 15 E 15
VENT RATE (KT-FT) 60970 63440
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-190800-
NORTHERN HILLS-
330 PM AST SAT APR 18 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 70 60 80
TEMP (24H TREND) 66 (-3) 85 (+2) 67 85
RH % (24H TREND) 99 (+2) 65 (-5) 100 64
WIND 20FT/EARLY(MPH) E 14 E 11 E 13 E 12
WIND 20FT/LATE(MPH) E 10 E 13 E 11 E 14
MIXING HGT(FT-AGL/MSL) 5190 5300
TRANSPORT WND (MPH) E 12 E 12
VENT RATE (KT-FT) 51900 53000
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-190800-
WEST COAST-
330 PM AST SAT APR 18 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 80 70 70 70
TEMP (24H TREND) 69 (-1) 87 (0) 68 87
RH % (24H TREND) 96 (+1) 64 (-3) 96 62
WIND 20FT/EARLY(MPH) E 16 E 11 E 13 E 11
WIND 20FT/LATE(MPH) E 12 E 11 E 12 E 12
MIXING HGT(FT-AGL/MSL) 4980 5000
TRANSPORT WND (MPH) E 8 E 9
VENT RATE (KT-FT) 34860 40000
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-190800-
EASTERN INTERIOR-
330 PM AST SAT APR 18 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLDY PCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 80 50 60 50
TEMP (24H TREND) 67 (-3) 84 (+3) 67 84
RH % (24H TREND) 99 (+3) 64 (-8) 99 63
WIND 20FT/EARLY(MPH) E 13 E 13 E 13 E 13
WIND 20FT/LATE(MPH) E 13 E 12 E 13 E 12
MIXING HGT(FT-AGL/MSL) 5120 5700
TRANSPORT WND (MPH) E 14 E 13
VENT RATE (KT-FT) 61440 62700
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-190800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST SAT APR 18 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLDY PCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 80 50 60 40
TEMP (24H TREND) 66 (-3) 79 (+2) 66 80
RH % (24H TREND) 100 (+1) 68 (-9) 100 68
WIND 20FT/EARLY(MPH) E 10 E 11 E 10 E 11
WIND 20FT/LATE(MPH) E 10 E 11 E 10 E 11
MIXING HGT(FT-AGL/MSL) 4550 4760
TRANSPORT WND (MPH) E 14 E 14
VENT RATE (KT-FT) 54600 57120
DISPERSION 5 5
DSI 5 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-190800-
CENTRAL MOUNTAIN RANGE-
330 PM AST SAT APR 18 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 90 80 60 80
TEMP (24H TREND) 63 (-4) 83 (+4) 64 83
RH % (24H TREND) 99 (+4) 68 (-5) 99 66
WIND 20FT/EARLY(MPH) E 12 E 8 E 10 E 8
WIND 20FT/LATE(MPH) E 9 E 9 E 9 E 9
MIXING HGT(FT-AGL/MSL) 5790 5850
TRANSPORT WND (MPH) E 9 E 10
VENT RATE (KT-FT) 46320 52650
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-190800-
CAYEY MOUNTAIN RANGE-
330 PM AST SAT APR 18 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLDY PCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 80 60 60 50
TEMP (24H TREND) 66 (-2) 80 (+3) 66 80
RH % (24H TREND) 100 (+1) 70 (-7) 100 70
WIND 20FT/EARLY(MPH) E 10 E 10 E 10 E 10
WIND 20FT/LATE(MPH) E 9 E 11 E 9 E 11
MIXING HGT(FT-AGL/MSL) 4970 5160
TRANSPORT WND (MPH) E 14 E 14
VENT RATE (KT-FT) 59640 61920
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-190800-
VIEQUES-
330 PM AST SAT APR 18 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 50 50 40
TEMP (24H TREND) 72 (-2) 85 (0) 72 85
RH % (24H TREND) 91 (+2) 59 (-3) 89 57
WIND 20FT/EARLY(MPH) E 18 E 17 E 17 E 17
WIND 20FT/LATE(MPH) E 17 E 16 E 17 E 13
MIXING HGT(FT-AGL/MSL) 3590 3630
TRANSPORT WND (MPH) E 16 E 17
VENT RATE (KT-FT) 50260 54450
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-190800-
CULEBRA-
330 PM AST SAT APR 18 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 50 50 50
TEMP (24H TREND) 74 (-1) 86 (+1) 74 87
RH % (24H TREND) 89 (+2) 58 (-6) 88 56
WIND 20FT/EARLY(MPH) E 18 E 16 E 17 E 16
WIND 20FT/LATE(MPH) E 18 E 16 E 17 E 13
MIXING HGT(FT-AGL/MSL) 3710 3760
TRANSPORT WND (MPH) E 20 E 17
VENT RATE (KT-FT) 63070 56400
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-190800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST SAT APR 18 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS TSTMS
CHANCE PRECIP (%) 60 30 50 40
TEMP (24H TREND) 69 (-3) 88 (+2) 69 88
RH % (24H TREND) 94 (+5) 58 (-5) 92 57
WIND 20FT/EARLY(MPH) E 10 E 16 E 12 E 16
WIND 20FT/LATE(MPH) E 13 E 17 E 11 SE 18
MIXING HGT(FT-AGL/MSL) 5570 5480
TRANSPORT WND (MPH) E 14 E 13
VENT RATE (KT-FT) 66840 60280
DISPERSION 5 5
DSI 5 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-190800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST SAT APR 18 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 50 40 50 50
TEMP (24H TREND) 73 (-3) 85 (+1) 73 85
RH % (24H TREND) 90 (+4) 57 (-7) 90 57
WIND 20FT/EARLY(MPH) E 18 E 17 E 18 E 17
WIND 20FT/LATE(MPH) E 17 E 17 E 17 E 14
MIXING HGT(FT-AGL/MSL) 3600 3720
TRANSPORT WND (MPH) E 21 E 21
VENT RATE (KT-FT) 64800 66960
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-190800-
ST CROIX-
330 PM AST SAT APR 18 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 50 50 40
TEMP (24H TREND) 72 (-3) 86 (+1) 72 86
RH % (24H TREND) 91 (+2) 60 (-5) 92 59
WIND 20FT/EARLY(MPH) E 17 E 16 E 16 E 16
WIND 20FT/LATE(MPH) E 17 E 14 E 17 E 13
MIXING HGT(FT-AGL/MSL) 4400 4570
TRANSPORT WND (MPH) E 20 E 17
VENT RATE (KT-FT) 74800 68550
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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